How can I execute Blender from a script?
If you are using Blender 2.5 onwards, it doesn't have a Blender module, the script you are trying to run was written for 2.49 or lower.

The equivalent script for Blender 2.7+ would be something like:

import bpy

c = bpy.context.scene
r = c.render

r.use_file_extension = True
r.filepath = 'c:\\temp'

#Set PAL 16:9 settings manually
r.resolution_x = 720
r.resolution_y = 576
r.pixel_aspect_x = 16
r.pixel_aspect_y = 11

r.image_settings.file_format = 'TARGA'
r.fps = 25
c.frame_start = 1       
c.frame_end = 100         

bpy.ops.render.render(animation=True)